How to play SumSprint

Every round deals nine number cards and a target sum that three of them can hit. Tap three cards; the sum checks automatically. Hit the target and the round pays out — a base that shrinks with every passing tenth of a second, plus a rising level bonus — and the next round deals instantly. Miss and you just adjust your picks. It’s pure mental arithmetic under a friendly clock: the kind of number sense TenSum builds, at sprint pace. Free at Skorven, browser-only.

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Tips & strategy

• Start from the target’s last digit: only a few triples can produce it, which prunes the board fast.
• Anchor with the biggest card that fits, then hunt a pair for the remainder — two-number sums are instant.
• A miss costs a moment, not the run — guess a strong pair early rather than staring at nine cards.

SumSprint FAQ

How is a round scored?

A time-based base — faster is worth more — plus a bonus that grows with the round you have reached.

What happens on a wrong sum?

The picks flash, clear, and three seconds come off the clock. Guessing your way through the combinations will run you out of time.

Is SumSprint free?

Completely — browser-based, no download, no signup.